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Truck lost power going down the road and stalled. Will crank…

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Truck lost power going down...
Truck lost power going down the road and stalled. Will crank over but will not run. Fuel rail pressure at 58 psi, and over 70psi while cranking. Have rpm reading of 145 while cranking but will not start. replaced fuel pump already same condition, I have dropped the gas tank and can get to the FPCM. Need some advice.
Submitted: 2 years ago.Category: Chevy
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Answered in 11 minutes by:
2/13/2016
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago
cloe0626
cloe0626, Auto Mechanic
Category: Chevy
Satisfied Customers: 824
Experience: was a mechanic in the army for four years and have been working at a dealer ship the past five years
Verified

are you getting a check engine light if so have you found out what codes it is giving

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Customer reply replied 2 years ago
I had two previous check engine lights while the truck was still running and never resolved them but like I said it was still running.
Customer reply replied 2 years ago
Give me about 10 min I can pull them for you.
Please hold
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

not a problem

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Customer reply replied 2 years ago
Ok 2 previously existing codes p0011, p0430
New codes p023f, p0452, p1682
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

the new codes are for a faulty fuel control module

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Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

that was the p023f p0452 is and emission code the p 1682 is low ignition switch voltage but morre then likely is caused by the fuel control module

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Customer reply replied 2 years ago
How should I go about testing this module
Customer reply replied 2 years ago
I see it just above the frame and have access to it
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

With the key in the off position, disconnect the Fuel Pump Flow Control Module and connect a test light to the Dk Green/White wire at pin 13. Then you turn the key on, engine off.it should light up that will let you know if you are getting power to it if you need anything else let me know and please be sure to rate my service when you get the chance

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Customer reply replied 2 years ago
can you stick around while I do some tests and go thru the results with me?/
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

yeah im going to be on for a little while longer

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Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

any luck

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Customer reply replied 2 years ago
plugging in now, had to eat something was about to pass the f out
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

ok just let me know

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Customer reply replied 2 years ago
we got 11 volts on the green/white wire on position and while cranking
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

its getting voltage atleast but according to code it is failing so i would say the unit is just bad

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Customer reply replied 2 years ago
what is the gray wire coming out of the module in terminal d
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

honestly im not for sure i dont have a diagram for it im at home not at work

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Customer reply replied 2 years ago
ok, I bypass the module and the pump is running continuously but the truck still crank and will not run. what is it about this module that will not allow the truck to start even tho the pump is running?
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

it regulates how much pressure to send to the injectors your fuel pressure should be around 44 psi

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Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

at the fuel rail shouldnt drop lower

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Customer reply replied 2 years ago
the fuel rail pressure is at 58psi and peaks at about 70 while cranking but still not running
Chevy Mechanic: cloe0626, Auto Mechanic replied 2 years ago

then your module and fuel pump is fine you need to test your injectors Using a Multimeter to Test Fuel InjectorResistance Ohms. Learn how to check fuel injectors to make sure they are working. You use a multimeter on the resistance settings and measure the ohms of the injector. All injectorsshould be within .5 ohms of each other

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